Whenever we send a request to the server for uploading a page, some queries executes multiple times or some queries takes long time to execute, as these are executed to fetch the content and to be displayed on the page to be loaded. So it affects the performance of the drupal website. That means you can face some problem with the website.

Imagine if we could determine which query is taking too much time in execution and which query is executing multiple times. But is it possoble ?

Actually we have already made it possible. Using "Devel module" we can keep our eye on every activity ( time of execution, No. of execution etc.) of query, generated by browser. Lets get the complete knowledge of this module that can help us in optimized drupal development.